[wideglidejoe]

If you use toluene, 1:9 or 1:10 with 92, 93, 94 unleaded is about optimum. If you mix toluene too rich, you'll tend to foul your plugs, exhaust is very sooty, and it acts like it is cold natured and never seems like it gets warmed up. (Experience: hot SBC in a Vega, back in the '70's.) I also remember a '60's street racing trick of adding 1 gal of laquer thinner and a handful of moth balls to the gas tank. Don't add to much, or you'll lean out and burn a hole in a piston.

Depending on the octane rating of av gas, it can be 20-30% toluene, with the remainder being alkylate, with xx grams of lead. Alkylate (and toluene) is "heavier" than other gasoline blend stocks (Platformate, FCCU cracked gasoline, etc), so it may require a little more advance on timing to fire it off and take full advantage of it.

After 32 yrs making/blending gasoline in a Sunoco refinery, I'd suggest buying racing fuel by the drum (pick your brand) and mixing it with the highest octane available at the pump. Experiment with ratios until you get what is best for your engine combo. 80/20, 85/15, or 90/10 might be all you need. Why run straight race gas or 50/50 if you don't need it?

Just my opinion, everybody's got one................